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Investment Securities Available for Sale - Schedule of Available for Sale Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | $ 1,315,465 | $ 1,417,724
Unrealized Gains | 19,197 | 21,031
Unrealized Losses | (44,647) | (25,674)
Fair Value | 1,290,015 | 1,413,081
Agency ARMs |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 82,239 | 93,331
Unrealized Gains | 10 | 22
Unrealized Losses | (2,921) | (2,281)
Fair Value | 79,328 | 91,072
Agency ARMs | Freddie Mac |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 29,384 | 33,623
Unrealized Gains | 0 | 16
Unrealized Losses | (1,161) | (852)
Fair Value | 28,223 | 32,787
Agency ARMs | Fannie Mae |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 48,610 | 54,958
Unrealized Gains | 10 | 6
Unrealized Losses | (1,624) | (1,236)
Fair Value | 46,996 | 53,728
Agency ARMs | Ginnie Mae |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 4,245 | 4,750
Unrealized Gains | 0 | 0
Unrealized Losses | (136) | (193)
Fair Value | 4,109 | 4,557
Agency Fixed- Rate |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 1,063,732 | 1,059,532
Unrealized Gains | 0 | 669
Unrealized Losses | (41,716) | (12,916)
Fair Value | 1,022,016 | 1,047,285
Agency Fixed- Rate | Freddie Mac |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 92,189 | 20,804
Unrealized Gains | 0 | 0
Unrealized Losses | (3,023) | (736)
Fair Value | 89,166 | 20,068
Agency Fixed- Rate | Fannie Mae |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 971,543 | 1,038,363
Unrealized Gains | 0 | 669
Unrealized Losses | (38,693) | (12,174)
Fair Value | 932,850 | 1,026,858
Agency Fixed- Rate | Ginnie Mae |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 0 | 365
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | (6)
Fair Value | 0 | 359
Agency IOs |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 0 | 41,367
Unrealized Gains | 0 | 271
Unrealized Losses | 0 | (10,459)
Fair Value | 0 | 31,179
Agency IOs | Freddie Mac |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 0 | 8,436
Unrealized Gains | 0 | 19
Unrealized Losses | 0 | (2,756)
Fair Value | 0 | 5,699
Agency IOs | Fannie Mae |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 0 | 11,310
Unrealized Gains | 0 | 22
Unrealized Losses | 0 | (2,989)
Fair Value | 0 | 8,343
Agency IOs | Ginnie Mae |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 0 | 21,621
Unrealized Gains | 0 | 230
Unrealized Losses | 0 | (4,714)
Fair Value | 0 | 17,137
Agency RMBS |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 1,145,971 | 1,194,230
Unrealized Gains | 10 | 962
Unrealized Losses | (44,637) | (25,656)
Fair Value | 1,101,344 | 1,169,536
Non-Agency RMBS |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 53,695 | 100,291
Unrealized Gains | 372 | 1,852
Unrealized Losses | (10) | (18)
Fair Value | 54,057 | 102,125
CMBS |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 115,799 | 123,203
Unrealized Gains | 18,815 | 18,217
Unrealized Losses | 0 | 0
Fair Value | 134,614 | 141,420
CMBS | Available-for-sale securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investment securities, available for sale, at fair value (including pledged securities of $976,113 and $1,076,187, as of June 30, 2018 and December 31, 2017, respectively, and $50,134 and $47,922 held in securitization trusts as of June 30, 2018 and December 31, 2017, respectively) | $ 50,100 | $ 47,900

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- Definition The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(b)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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